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| All Patents in class 353/40 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,928,001 | Sep. 26, 1933 | C.E. Ruf, L.G. Spealman, P.D. Ritchey, E.H. Aldeborgh | Projection Indicator Measuring Instrument | ||
| 2,224,281 | Dec. 10, 1940 | G.D. Webber | Measuring Instrument | measurement gauges | |